Extension try-square.



l. H. NEEDHAM.

EXTENSION TRY SQUARE. Arrucmon mtu ocr. n. lm.

1 ,1 90,941. Patented July 11, 1916.

1m .man n unit-mul m'. l l

JOSEPHH. NEEDHAM, 0F BRISTOW, IO`WA.A

EXTENSION TRY-SQUARE.

specicarin gf Letters Patent.

Application filed October 13, 1915. Serial No. V55,678.

To all whom t may concern:

Be it known that I, JOSEPH I-I. NEEDHAM, a -citizen of the United States, residing at Bristow, in the county of Butler and State of Iowa, have invented certain new and useful Improvements in Extension T ry-Sguares, of which the following is a specification.

The present invention relates to improvements in tools and in particular to those known as try-squares.

The essence of theinvention lies in the provision for extension of the square blade so as to obtain a greater degree of measuring capacity for the tool while preserving a compact form.

To a not inconsiderable degree, the connections for the adjustable sections of this implement, constitute an important feature of this construction and with this in view the invention consists of a stock to-which is rigidly secured a stationary blade, and upon which is mounted an adjustable extensible section, means being provided intermediate said sections for holding them at adjusted positions.

For a full understanding of the present invention, reference is to be had to the following description and the accompanying drawing, in which:

Figure l is a perspective view of an enibodiment of my invention and showing the extensible section in extended position. Fig. 2 is a side elevation of the tool showing a longitudinal section of the blade. Fig. 3

' is a side elevation of one half of the extensible section of the blade. Fig. 4 is a vertical sectional view taken about on the plane indicated by the line 4 4 of Fig. 1.

Throughout the following detail description and on the several figures of the drawings, similar parts are referred to by like reference characters.

Referring to the drawing, the numeral l designates the stock of the square which is provided, as customary, at one end with a slot to receive the end of the blade secured at right angles to said stock. The stock may consist of more than one piece of material, as shown in the drawing, said pieces being secured with the blade positioned therebetween by fastening members 2. The blade of this device is of special construction in that it consists of a relatively stationary section 3 and an extensible section 4 mounted thereon. The stationary section 3 is graduated at its longitudinal edges in a customary manner and provided with suitable indicia for indicating the measurements according to standard ruling. tending longitudinally of this section on one side of the same is a rib or tongue 5, said tongue coperating with the stock of the square to reinforce the connection of said blade to the stock as most clearly shown in Fig. 2 where the stock Yis broken away and shown in section. The blade ysection 3,

furthermore, is provided with a slot 6r at each side ofthe tongue and said section is received withinan open slot formed in the extensible section 4.

The section 4`may y consist of two pieces of material secured together at one end by means of a fastening member 7, one of such cent to the extreme outer end, and I do not wish to be limited to an element which is made up of separate pieces, as just described. One side of the extensible section, that designated 4, is provided with projections 8 which engage in the slots 6 of the stationary section 3. Fastening members 9 extend through these projections into the extensible section 4 whereby to connect the sides of said last-mentioned section together and prevent accidental separation of the side members. One of said side members of the eX- tensible section 4 is formed with a longitudinal groove 10 in which is received therib or tongue 5. This interlocking tongue and groove connection maintains the extensible section 4 relatively in alinement with the stationary section 3 Vthroughout its longitudinal movement or adjustment. The positive interlocking connections formed by the connection of the projections 8 with the Patented July 11, v1,916.

slot 6 coact with the tongue and groove to spring or similar friction means 12 friction` .v ally engaging against one side of the extcnsible section 4. The function of this spring is to cause a slight frictional binding between the blade sections soastohold said sections in relative positions with respect to each other.

As shown in Fig. l, the extensible section uremeynts= or making marking' lines of a` greaten length. than theV normal length of-` the blade.

Hawing thus described, my invention, what I claim asnew is:

l. A try-square comprising a stock, a blade. secured thereto consisting of relatively stationary and movable sections, the movable section comprising spaced side members between; which thed stationary sectiona is Goniesof thispatent maybe obtained fox` ve cents each, by addressing the Commissioner df Patentl,

Washington, D. C.

' received,

the stationary section hav spacedI longitudinally extending slots, allxi fastening members connecting the side meut` bers aforesaid and passing through the slow r of1 thel stationary member whereby to pr0" vide for sliding action of the movable blade member. 2.. A try-square comprising a stock, a blade secured thereto and conslsting of a relu" atively stationary section and an, extensiblqtn` section, the extensible section consisting` spacedsidemembers between which the Stn tionaryA section is received,u a Spacingl mem ber intermediate the side members at om` end, foryholding the sidemernbersin spamde relation. and; constituting a. stop coperatie@ with. the extremity of. the stationary. sectimm, t said, stationary section. having spaced. lo gitudinally extending slots, fastemn y m p connecting the lside members to p extending. through. said slots, an a. tough. and groove connection for, said: Sections` an ranged, between the. slots of theV Statonalwt sectlon.

In, testimony whereof I aflx my signature,

Jos-EPH H. NEEDHAM. 

